Get element at the specific position from matrix in R
Last Updated :
20 Dec, 2023
At any point in time, a matrix may be required to be traversed for an element at a specific position. In this article, we are going to access the elements from a matrix in R Programming Language using integer vector, and logical vector as the index.
Accessing Elements in a Matrix
In R Programming Language we have several methods to Accessing Elements in a Matrix In R we can access matrix elements using square brackets [ ] notation.
Create a matrix
R
mat <- matrix(1:12,3,4)
mat
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Output:
[,1] [,2] [,3] [,4]
[1,] 1 4 7 10
[2,] 2 5 8 11
[3,] 3 6 9 12
Accessing Single Element in a Matrix
R
mat <- matrix(1:12,3,4)
mat
element <- mat[1, 2]
print(element)
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Output:
[,1] [,2] [,3] [,4]
[1,] 1 4 7 10
[2,] 2 5 8 11
[3,] 3 6 9 12
[1] 4
Accessing Entire Row or Column
R
row_vector <- mat[2, ]
print(row_vector)
col_vector <- mat[, 3]
print(col_vector)
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Output:
[1] 2 5 8 11
[1] 7 8 9
Accessing Subsetting Matrix
R
mat <- matrix(1:12,3,4)
subset_mat <- mat[1:2, 2:3]
print(subset_mat)
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Output:
[,1] [,2]
[1,] 4 7
[2,] 5 8
Accessing matrix Conditional Access
R
mat <- matrix(1:12,3,4)
greater_than_5 <- mat[mat > 5]
print(greater_than_5)
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Output:
[1] 6 7 8 9 10 11 12
These methods provide flexibility depending on our specific needs and the structure of our matrices. Choose the one that best fits our use case.
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